   <div class="navbar-default sidebar" role="navigation">
                <div class="sidebar-nav navbar-collapse">
                    <ul class="nav" id="side-menu">
                        <li class="sidebar-search">
                            <div class="input-group custom-search-form">
                                <input type="text" class="form-control" placeholder="Search...">
                                <span class="input-group-btn">
                                <button class="btn btn-default" type="button">
                                    <i class="fa fa-search"></i>
                                </button>
                            </span>
                            </div>
                            <!-- /input-group -->
                        </li>
                        <li>
                            <a href="index.html"><i class="fa fa-dashboard fa-fw"></i>后台</a>
                        </li>
                        <li>
                            <a href="#"><i class="fa fa-bar-chart-o fa-fw"></i>前台用户管理<span class="fa arrow"></span></a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('User/index')}">用户列表</a>
                                </li>
                                <li>
                                    <a href="{:U('User/laji')}">回收站</a>
                                </li>
                            </ul>
                            <!-- /.nav-second-level -->
                        </li>
                         <li>
                            <a href="#"><i class="fa fa-bar-chart-o fa-fw"></i>后台用户管理<span class="fa arrow"></span></a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('Auser/index')}">用户列表</a>
                                </li>
                                <li>
                                    <a href="{:U('Auser/laji')}">回收站</a>
                                </li>
                                <li>
                                    <a href="{:U('Group/index')}">分组列表</a>
                                </li>
                                <li>
                                    <a href="{:U('Rule/index')}">权限列表</a>
                                </li>
                            </ul>
                            <!-- /.nav-second-level -->
                        </li>
                        <li>
                            <a href="{:U('type/index')}"><i class="fa fa-table fa-fw"></i>分类管理</a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('Type/index')}">可显示分类</a>
                                </li>
                                <li>
                                    <a href="{:U('Type/jinyongshow')}">被禁用分类</a>
                                </li>
                            </ul>
                        </li>
                        <li>
                            <a href="{:U('Book/index')}"><i class="fa fa-edit fa-fw"></i> 图书管理</a>
                             <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('Book/index')}">所有图书</a>
                                </li>
                                <li>
                                    <a href="{:U('Book/jinyongshow')}">下架图书</a>
                                </li>
                            </ul>
                        </li>
                        <li>
                            <a href="{:U('mokuai/index')}"><i class="fa fa-edit fa-fw"></i>首页小模块</a>
                             <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('Book/index')}">所有图书</a>
                                </li>
                                <li>
                                    <a href="{:U('Book/jinyongshow')}">下架图书</a>
                                </li>
                            </ul>
                        </li>
                        <li>
                            <a href="#"><i class="fa fa-wrench fa-fw"></i> UI Elements<span class="fa arrow"></span></a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="panels-wells.html">Panels and Wells</a>
                                </li>
                                <li>
                                    <a href="buttons.html">Buttons</a>
                                </li>
                                <li>
                                    <a href="notifications.html">Notifications</a>
                                </li>
                                <li>
                                    <a href="typography.html">Typography</a>
                                </li>
                                <li>
                                    <a href="icons.html"> Icons</a>
                                </li>
                                <li>
                                    <a href="grid.html">Grid</a>
                                </li>
                            </ul>
                            <!-- /.nav-second-level -->
                        </li>
                        <li>
                            <a href="#"><i class="fa fa-sitemap fa-fw"></i> Multi-Level Dropdown<span class="fa arrow"></span></a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="#">Second Level Item</a>
                                </li>
                                <li>
                                    <a href="#">Second Level Item</a>
                                </li>
                                <li>
                                    <a href="#">Third Level <span class="fa arrow"></span></a>
                                    <ul class="nav nav-third-level">
                                        <li>
                                            <a href="#">Third Level Item</a>
                                        </li>
                                        <li>
                                            <a href="#">Third Level Item</a>
                                        </li>
                                        <li>
                                            <a href="#">Third Level Item</a>
                                        </li>
                                        <li>
                                            <a href="#">Third Level Item</a>
                                        </li>
                                    </ul>
                                    <!-- /.nav-third-level -->
                                </li>
                            </ul>
                            <!-- /.nav-second-level -->
                        </li>
                        <li>
                            <a href="#"><i class="fa fa-files-o fa-fw"></i> 友情链接<span class="fa arrow"></span></a>
                            <ul class="nav nav-second-level">
                                <li>
                                    <a href="{:U('link/link')}">友情链接功能</a>
                                </li>
                                <li>
                                    <a href="login.html">Login Page</a>
                                </li>
                            </ul>
                            <!-- /.nav-second-level -->
                        </li>
                    </ul>
                </div>
                <!-- /.sidebar-collapse -->
            </div>